1920s radio prospecting w/illustrations, National Radio Institute

Old 1927 book on the technology of radio prospecting. This is published by the National Radio Institute as Lesson No. 43 of their - Complete Course in Practical Radio -.

This has 29 pages with drawings, schematics, and photos of different radio prospecting equipment.

This is in very nice vintage condition, but it does have a half page of notes in pencil on the last page.